Actually I know what it is ... it's a large code base, fully available, very graphical, and with reasonable performance demands. So many years ago, Vertigo ported Quake II to managed C++ to show how performant the app was and how easy it was to integrate something that is quick to do in managed code - a partially transparent bad-guy locator if I remember correctly. That was five years ago, before C++/CLI, so it was a thicket of underscores and general hard-to-read misery.